Debugging (single stepping and access violations)

Hi,

I`m not sure this is off-topic for comp.compilers so bear with me :)

I`ve just written BASIC language compiler for Windows, and I`ve ran
into a problem on the debugger.

The debugger uses the windows debug API and so far I`ve got
break-points, debug symbols, resumes, etc. working without too much
hassle - but for single stepping I`ve ran into issues.

After trying tons of ways around this I created a very simple debug
loop (in the debug thread).

While Not Finished
        {
          If WaitForDebugEvent(Blah,0) Then
                  {

ContinueDebugEvent(DebugEvent.dwProcessId,DebugEvent.dwThreadId,DBG_CONTINUE
);
                  EnterSingleStepMode ;
                  }
        }

I monitor (via break-points) the debugeers thread and notice that apps
will (very quickly) EXCEPTION_ACCESS_VIOLATION in what appears to be
'windows' memory range. I`ve even tried notepad.exe, does the same -
so its not my executables.

Does anyone have any ideas at where I could be going wrong? Its driving me
nuts!

Thanks!! James.

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